Class 12 Physics Book UP Board. We covered all the Class 12 Physics Book UP Board in this post for free so that you can practice well for the exam.
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Class 12 Physics Book UP Board MCQs for Students
In the Fraunhofer diffraction pattern due to a single slit of width 0.2 mm and illuminated by the light of wavelength 5000 A°. The half angular width of the central maximum will be
(A) 30°
(B) 5° 9′
(C) 9′
(D) 36′
Option c – 9′
In the Fraunhofer diffraction pattern due to a single slit of width 0.05mm, the fourth dark band occurs in a direction making an angle of 2° 40′ with the normal to the plane of the slit. The wavelength of light used is :
(A) 6000 A°
(B) 4825 A
(C) 5400 A°
(D) 5825 Aº
Option d – 5825 Aº
The semi-vertical angle subtended by two points on a glass slide at the objective of a microscope is 10°. If the wavelength of illuminating light is 0.5208 μm. The minimum separation between the two points, when they are just resolved, will be (sin 10° = 0.1736) :
(A) 15 μm
(B) 0.15 μm
(C) 1.5 μm
(D) 1500 μm
Option a – 15 μm
Diameter of radio telescope is in the range of same
(A) centimeter
(B) meter
(C) kilometer
(D) milimeter
Option c – kilometer
A radio telescope is used to see :
(A) stars and to measure diameters
(B) distant stars and planets
(C) high-frequency waves
(D) the sun and to measure its temperature
Option b – distant stars and planets
The ability of an optical instrument, expressed in numerical measure to resolve the images of two nearly points is termed as its :
(A) refractive index
(B) limit of resolution.
(C) resolving power
(D) all of these
Option c – resolving power
The resolving power of a microscope is increased by :
(A) increasing the refractive index between the object and the objective
(B) decreasing the wavelength
(C) increasing the wavelength
(D) both (A) and (B)
Option d – both (A) and (B)
The reciprocal of the smallest angular separation between two distant objects, so that they appear just separated (resolved) is called :
(A) resolving power of the convex lens
(B) resolving power of biprism
(C) resolving power of a microscope
(D) resolving power of a telescope
Option d – resolving power of a telescope
The resoling power of a telescope can be increased by :
(A) increasing the diameter of the objective of the telescope
(B) decreasing the wavelength of light
(C) decreasing the diameter of the objective of the telescope
(D) both (A) and (B)
Option d – both (A) and (B)
We covered all the class 12 physics book up board above in this post for free so that you can practice well for the exam.
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